Township · Illinois
Algonquin Township, Illinois
Algonquin Township, township, in McHenry County, Illinois. Algonquin Township had 89,435 residents on July 1, 2025 by the Census Bureau's estimate, up 2.1% since 2020; the 2020 Census counted 87,633 and the ACS 2020-2024 5-year estimates put it at 88,108 (±40). GEOID 1711100698.
Residents, July 2025 estimate
89,435
Census Bureau estimate (no margin published)
2020 Census count: 87,633 · ACS 2020-2024: 88,108 ±40
Median household income
$110,071
±$3,084 (90% margin)
Illinois: $83,390
Median home value
$304,400
±$7,500 (90% margin)
Illinois: $263,300
Median gross rent
$1,520
±$94 (90% margin)
Illinois: $1,274
Where is Algonquin Township and what county is it in?
Algonquin Township is a township in McHenry County, Illinois. It covers 46.5 square miles of land, 1,885 residents per square mile in 2020.
6 places lie inside Algonquin Township, the largest Crystal Lake (city, 40,269 residents in 2020); 4 places lie partly in it.
- Crystal Lake city, 40,269 in 2020
- Algonquin village, 29,700 in 2020
- Lake in the Hills village, 28,982 in 2020
- Cary village, 17,826 in 2020
- Fox River Grove village, 4,702 in 2020
- Trout Valley village, 515 in 2020
- Lakewood village, partly in the town
- Barrington Hills village, partly in the town
- Oakwood Hills village, partly in the town
- Port Barrington village, partly in the town
Algonquin Township is in the Chicago-Naperville-Elgin, IL-IN metropolitan statistical area, which takes in 13 counties (Census Bureau delineation, July 2023).
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Algonquin Township, and is it growing?
The Census Bureau estimates that 89,435 people lived in Algonquin Township on July 1, 2025, up 2.1% since 2020, while Illinois shrank 0.8%. The 2020 Census counted 87,633 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 88,108 (±40).
| Measure | Algonquin Township | McHenry County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 88,108±40 | 312,591 | +678 |
| Households | 32,844±615 | 117,594 | no clear change |
| Average household size | 2.68±0.05 | 2.64 | no clear change |
| Housing units | 34,056±569 | 121,329 | no clear change |
Algonquin Township's population since 2000
From 86,219 in 2000 to 89,435 in 2025: up 3.7%. The 2000, 2010 and 2020 figures are census counts, each for Algonquin Township as it was drawn that year: a place that annexed land, or a community that has since incorporated, covered a different area then. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); Census PEP Vintage 2025 (SUB-EST2025, CO-EST2025); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Algonquin Township?
The median resident of Algonquin Township is 39.4 years old; 22.7% are under 18 and 14.6% are 65 or older. The largest group is non-Hispanic white residents at 75.8%, then Hispanic or Latino residents (of any race) at 15.7%. 10.5% of residents were born outside the United States.
| Measure | Algonquin Township | McHenry County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 39.4±0.8 | 40.7 | no clear change |
| Under 18 years | 22.7%±0.8 pts | 22.7% | – |
| 65 years and over | 14.6%±0.7 pts | 16.5% | – |
| Male | 49.8%±0.8 pts | 50.1% | – |
| Hispanic or Latino (any race) | 15.7%±1.5 pts | 16.1% | +3.1 pts |
| White alone, not Hispanic | 75.8%±1.6 pts | 76.1% | −4.6 pts |
| Black or African American alone, not Hispanic | 1.4%±0.6 pts | 1.4% | no clear change |
| Asian alone, not Hispanic | 2.8%±0.5 pts | 3.0% | no clear change |
| American Indian and Alaska Native alone, not Hispanic | 0.1%±0.1 pts | 0.0% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±0.1 pts | 0.0% | – |
| Two or more races, not Hispanic | 4.0%±0.9 pts | 3.2% | – |
| Some other race alone, not Hispanic | 0.3%±0.2 pts | 0.2% | – |
| Born outside the United States | 10.5%±0.9 pts | 9.9% | no clear change |
| Speak a language other than English at home (age 5+) | 16.8%±1.3 pts | 16.1% | – |
| Civilian veterans (age 18+) | 4.8%±0.7 pts | 5.6% | – |
| With a disability | 9.6%±0.8 pts | 10.1% | – |
| No health insurance coverage | 3.8%±0.6 pts | 4.5% | −1.1 pts |
| High school graduate or higher (age 25+) | 94.8%±0.8 pts | 93.7% | – |
| Bachelor's degree or higher (age 25+) | 39.3%±1.6 pts | 35.2% | no clear change |
| Graduate or professional degree (age 25+) | 13.2%±0.9 pts | 12.0% | – |
| Lived in the same house a year earlier | 92.7%±0.9 pts | 91.4% | – |
| Moved from another state in the past year | 1.1%±0.5 pts | 1.0% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Algonquin Township earn?
Half of Algonquin Township's 32,844 households earn less than $110,071 a year (±$3,084), against $104,802 in McHenry County and $83,390 in Illinois. In 2015-2019 it was $110,529 in 2024 dollars; the margins of error cannot tell the two periods apart. 6.0% of residents live below the poverty line.
| Measure | Algonquin Township | McHenry County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $110,071±$3,084 | $104,802 | no clear change |
| Mean household income | $132,993±$4,414 | $130,520 | – |
| Per capita income | $49,567±$1,781 | $49,388 | no clear change |
| People below the poverty line | 6.0%±1.1 pts | 6.2% | no clear change |
| Children under 18 below the poverty line | 7.9%±2.8 pts | 8.2% | no clear change |
| Households receiving SNAP | 7.5%±1.2 pts | 7.4% | – |
| Households with a computer | 98.0%±0.7 pts | 97.7% | – |
| Households with a broadband subscription | 96.0%±0.9 pts | 95.4% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Algonquin Township?
Owners occupy 82.1% of Algonquin Township's occupied homes and renters 17.9%. The median owner-occupied home is valued at $304,400 by its owner (±$7,500). The median renter pays $1,520 a month including utilities, and 41.8% of renters pay 35% or more of their income on rent.
| Measure | Algonquin Township | McHenry County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $304,400±$7,500 | $308,100 | +$32,663 |
| Median gross rent | $1,520±$94 | $1,401 | −$118 |
| Renters paying 35% or more of income on rent | 41.8%±5.8 pts | 38.1% | no clear change |
| Median monthly owner costs, with a mortgage | $2,140±$60 | $2,137 | – |
| Owner-occupied homes | 82.1%±2.0 pts | 82.7% | no clear change |
| Renter-occupied homes | 17.9%±2.0 pts | 17.3% | – |
| Housing units | 34,056±569 | 121,329 | no clear change |
| Homeowner vacancy rate | 0.5%±0.4 pts | 0.5% | – |
| Rental vacancy rate | 4.8%±2.8 pts | 2.9% | – |
| Single-family detached homes | 73.0%±1.5 pts | 77.3% | – |
| Mobile homes | 1.0%±0.3 pts | 0.7% | – |
| Built 2020 or later | 0.8%±0.5 pts | 1.1% | – |
| Built 2010 to 2019 | 3.5%±0.9 pts | 4.4% | – |
| Built 1939 or earlier | 6.6%±1.2 pts | 8.0% | – |
| Households with no vehicle | 3.9%±1.0 pts | 3.5% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How do people in Algonquin Township work and get to work?
70.4% of Algonquin Township's workers drive alone and 18.0% work from home. The average trip to work takes 30.3 minutes. The unemployment rate in 2020-2024 averaged 5.5%.
| Measure | Algonquin Township | McHenry County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 72.7%±1.3 pts | 69.7% | – |
| Unemployment rate | 5.5%±0.8 pts | 4.7% | +1.1 pts |
| Drove alone to work | 70.4%±2.0 pts | 72.9% | – |
| Carpooled | 8.1%±1.6 pts | 7.7% | – |
| Public transportation | 2.1%±0.5 pts | 1.3% | – |
| Walked | 0.7%±0.3 pts | 1.1% | – |
| Worked from home | 18.0%±1.4 pts | 16.1% | +11.8 pts |
| Mean travel time to work | 30.3 min±0.8 | 30.1 min | −2.7 min |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What census tracts are in Algonquin Township?
18 census tracts lie mostly in Algonquin Township (2020 census blocks). Their median household incomes run from $63,378 (Tract 8713.13) to $183,094 (Tract 8713.05).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 8712.01McHenry County | 7,035 | $109,451 |
| Tract 8712.06McHenry County | 6,979 | $139,913 |
| Tract 8713.12McHenry County | 5,867 | $128,245 |
| Tract 8712.02McHenry County | 5,757 | $80,833 |
| Tract 8713.05McHenry County | 5,706 | $183,094 |
| Tract 8714.02McHenry County | 5,596 | $125,938 |
| Tract 8713.07McHenry County | 5,310 | $131,290 |
| Tract 8713.11McHenry County | 5,078 | $110,000 |
| Tract 8716McHenry County | 4,954 | $103,819 |
| Tract 8713.01McHenry County | 4,870 | $92,583 |
| Tract 8713.10McHenry County | 4,707 | $135,040 |
| Tract 8714.04McHenry County | 4,312 | $118,021 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files (tract share = share of the tract's census blocks in Algonquin Township) · Census block assignment files
How does Algonquin Township compare with other places in Illinois?
By the Census Bureau's July 2025 estimates, Algonquin Township is the 60th-most populous of the 16,079 U.S. towns and townships that have one and the 28th-most populous of 1,407 in Illinois.
Algonquin Township ranks 232nd of 1,380 places in Illinois with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 28th | 1,407 |
| Growth 2020-2025 (PEP) | 126th | 1,347 |
| Residents per square mile | 311th | 1,383 |
| Median household income | 232nd | 1,380 |
| Per capita income | 279th | 1,383 |
| Median home value | 240th | 1,379 |
| Median gross rent | 193rd | 1,280 |
| Poverty rate | 890th | 1,119 |
| Bachelor's degree or higher | 274th | 1,369 |
| Median age | 884th | 1,383 |
| Owner-occupied share | 489th | 1,382 |
| Work from home | 188th | 1,015 |
| Travel time to work | 264th | 1,382 |
Algonquin Township's figures with every place in Illinois (CSV)
Every place in Illinois, sortable · Compare Algonquin Township with other places
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How reliable are the figures for Algonquin Township?
4 of the 57 figures for Algonquin Township on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
The American Community Survey samples about one household in eight over five years, so every figure is an estimate with a 90% margin of error (shown under each value). A ring marks an estimate whose coefficient of variation is over 40%. A change is called only when the gap between the two periods is larger than their combined 90% margin (the square root of the sum of the two squared margins), the Census Bureau's test. How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · ACS technical documentation
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Algonquin Township are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.